Iterate over zbchaos worker error handling

[ChrisKujawa]

Right now the zbchaos worker spawns a Zeebe worker and connects via the provided env vars to a camunda cloud cluster.

It registers for the zbchaos job type and will forward all further commands like verify readiness, via calling root again. https://github.com/zeebe-io/zeebe-chaos/blob/main/go-chaos/cmd/worker.go#L115

I feel there is one issue with this approach. Our commands call panic on error, which normally just exits the CLI with the error. In a case of a failure during executing the job worker we DON'T want to exit, we want to retry or fail the job.

This means we need to extract all logic used in the commands in separate functions to return errors, in the subCommands we can then call panic in our workers we have to handle the errors differently.

\cc @oleschoenburg